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Server 2003 and XP Client; Why are HTTP connections being silently dropped.

- by Asa Yeamans

On my network, my edge-router, a windows 2003 r2 server router with all the latest updates, will drop packets, but only under specific circumstances. I have troubleshot and isolated it down to the most simple configuration i can. There is NO NAT involved. Only fully-public IP addresses. No Firewalls are running either, all ahve been disabled. no packet filters on any interfaces anywhere either. I have a single Windows XP virtual machine and my edge-router(the windows 2003 r2 server, and also a virtual machine) running on a windows 2008 x64 r2 system (running virtual server 2005 as i dont have Intel-VT compatible chip yet). The edge router can access any external http site just fine, no issues. However the windows XP machine is only able to access certain sites. These work: www.google.com www.txstate.edu www.workintexas.com www.thedailywtf.com . These Dont: www.yahoo.com www.utexas.edu en.wikipedia.org slashdot.org www.bing.com. I have removed all possibility of DNS issues by connecting with net-cat from the XP box and sending GET /\r\nHost: \r\n\r\n and that connection replicates the issue as well. The network setup: My statically assigned IP block: x.x.x.168/29 DSL Modem -----PPPoE Connection---- x.x.x.169[EdgeRouter] [EdgeRouter]x.x.x.170 -----Virtual Ethernet----- x.x.x.174 [Test2] Test2's Default gateway is x.x.x.170 and test2 can ping any and every valid, accessible, public IP address with no packet loss what-so-ever. If i connect directly over PPPoE from test2 (the XP box) everything works just fine... Im at my wits end, i have NO IDEA whats causing this.

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Juniper router dropping pings to external interface

- by Alexander Garden

My organization has a Juniper SSG20-WLAN that routes our traffic to the outside world. We've been having intermittent problems with our internet connection so I wrote up a Python script to ping the internal interface of the router, the external interface, a couple of our internal servers, the ISP router our router talks to, their upstream provider, and Google and Yahoo for good measure. It does that about every minute. What I have found is that when our internet goes out, our Juniper router ceases responding to pings on the external interface. Everything past that is, of course, unreachable. The internal interface and our internal servers continue to echo back without interruption. None of the counters indicate dropped packets of any type. They all look normal. The logs complain about VIP servers being unavailable but otherwise nothing indicative of network issues. My questions are these: Does this exonerate our ISP? Or, contrawise, might a problem with the connection be causing the external interface to go down? Is there somewhere else in the SSG20, beside the system log and counters, that might help me track down info on the problem? UPDATE: Turned out that one of the switches between my monitoring box and the router was a router itself, and occasionally diverting from the gateway to itself. Kudos to those who made suggestions along those lines. Not really sure which answer to mark as accepted, as it was really stuff in the comments that turned out to be right. Thanks for the suggestions.

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script to list user's mapped drive not giving results or error

- by user223631

We are in the process of migrating two file servers to a new server. We have mapped drives via user group in group policy. Many users have manually mapped drives and we need to find these mappings. I have created a PowerShell script to run that remotely get the drive mappings. It works on most computers but there are many that are not returning results and I am not getting any error messages. Each workstation on the list creates a text file and the ones that are not returning results have no text in the files. I can ping these machines. If the machine is not turned on, it does come up error message that the RPC server is not available. My domain user account is in a group that is in the local admin account. I have no idea why some are not working. Here is the script. # Load list into variable, which will become an array of strings If( !(Test-Path C:\Scripts)) { New-Item C:\Scripts -ItemType directory } If( !(Test-Path C:\Scripts\Computers)) { New-Item C:\Scripts\Computers -ItemType directory } If( !(Test-Path C:\Scripts\Workstations.txt)) { "No Workstations found. Please enter a list of Workstations under Workstation.txt"; Return} If( !(Test-Path C:\Scripts\KnownMaps.txt)) { "No Mapping to check against. Please enter a list of Known Mappings under KnownMaps.txt"; Return} $computerlist = Get-Content C:\Scripts\Workstations.txt # Loop through each item in the array (each computer in the list of computers we loaded into the variable) ForEach ($computer in $computerlist) { $diskObject = Get-WmiObject Win32_MappedLogicalDisk -computerName $computer | Select Name,ProviderName | Out-File C:\Tester\Computers\$computer.txt -width 200 } Select-String -Path C:\Tester\Computers\*.txt -Pattern cmsfiles | Out-File C:\Tester\Drivemaps-all.txt $strings = Get-Content C:\Tester\KnownMaps.txt Select-String -Path C:\Tester\Drivemaps-all.txt -Pattern $strings -notmatch -simplematch | Out-File C:\Tester\Drivemaps-nonmatch.txt -Width 200 Select-String -Path C:\Tester\Drivemaps-all.txt -Pattern $strings -simplematch | Out-File C:\Tester\Drivemaps-match.txt -Width 200

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Ubuntu Server Wireless connection issue - replaced router but kept ESSID

- by Stevo

I have a ubuntu server 12.04 which was connected to my wireless network with no problem I replaced the wireless router but kept the ESSID and password the same. All other devices on network have connected correctly. However the Ubuntu Server will not route correctly. It will connect to the wifi router, and get a dhcp served IP address, however it will not route anything. I cannot ping the router from the server. the contents of /etc/resolve.conf are updated with the information from the router, (the host name has been served) I know there is nothing wrong with the router or the server, or the wireless card etc. I'm assuming there's some cached setting that associates the old router with the ESSID and causing the issue. I've got a lot of other devices connected to the router, so don't want to change the name of the ESSID. How do I fix this? EDIT: outputs (abbreviated as I've got no cut and paste) netstat -rn: Kernel IP Routing table Dest Gate Gen Flags MSS Window irtt Iface 0.0.0.0 192.168.0.1 0.0.0.0. UG 0 0 0 wlan0 192.168.0.0 0.0.0.0. 255.255.255.0 U 0 0 0 wlan0

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Wireless very slow on one laptop on network, all other machines normal?

- by th3dude19

My new laptop (Acer Aspire Timeine 3810TZ running Windows 7 Home Premium 64bit) is acting very strange on my wireless network. Below are the issues I'm noticing... The connection frequently drops. I see the icon change from 'full bars' to 'empty bars with yellow star (meaning no connection)' occasionally. Almost every website I visit (Firefox) hangs for a long time on 'Looking up www.amazon.com' for example. After a long pause, it finally starts loading the website. Neither of these problems exist on any other machines on my network. I also have a desktop running the same OS wirelessly and it works fine. I've run several Speedtest.net tests and the speeds are great (20MBit down/4 up). Results from pingtest.net are as follows: Line quality: D Ping: 46ms Jitter: 65ms Packet Loss: 9% These results are to a server that is less than 10 miles from my residence. The results on the other machines in my house are normal. Any suggestions? This is becoming very annoying as I purchased this machine primarily for browsing.

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Connection timed out on Node.js app running under CentOS

- by ss1271

I followed this tutorial to create a simple node.js app on my CentOS: the node.js version is: $ node -v v0.10.28 Here's my app.js: // Include http module, var http = require("http"), // And url module, which is very helpful in parsing request parameters. url = require("url"); // show message at console console.log('Node.js app is running.'); // Create the server. http.createServer(function (request, response) { request.resume(); // Attach listener on end event. request.on("end", function () { // Parse the request for arguments and store them in _get variable. // This function parses the url from request and returns object representation. var _get = url.parse(request.url, true).query; // Write headers to the response. response.writeHead(200, { 'Content-Type': 'text/plain' }); // Send data and end response. response.end('Here is your data: ' + _get['data']); }); // Listen on the 8080 port. }).listen(8080); However, when I uploaded this app onto my remote server (assume the address is 123.456.78.9), I couldn't get access to it on my browser http://123.456.78.9:8080/?data=123 The browser returned Error code: ERR_CONNECTION_TIMED_OUT. I tried the same app.js code which runs fine on my local machine, is there anything I am missing? I tried to ping the server and its address was reachable. Thanks.

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Raspberry pi slows down my entire network

- by gnusouth

Whenever my Raspberry Pi is connected to the network (via ethernet) the entire network is slowed to a crawl. On my main computer, ping times for google.com go from ~10ms to ~200ms and it takes forever to load web pages. Connections are also slow on the Pi, with an apt-get update showing pathetic speeds in the order of 1KB/s. Turning off the Pi completely removes the drag from the network. I've tried static and dynamic IP addresses for the Pi, but both have the same problems. I'm currently using Raspbian (downloaded today), but also had this problem with Arch Linux. I've checked the connection's duplex with dmesg | grep -i duplex, which shows that the Pi's connection is running at 100Mbps, full-duplex, as expected. My modem/router is a Billion 7404VNPX (an Australian thing); relatively high-end, albeit a bit buggy at times (it will occassionally delete all its firewall settings). It assigns IPs in the range 192.168.1.1 to 192.168.1.20 and has 192.168.1.254 as its own IP. When I assign static IPs I tend to use the 192.168.1.200 area. Does anyone have any idea as to what could be causing this weird slowdown? Or any tests I could try? Thanks

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Setup my domain at Whois.com as nameservers for a Dedicated Server with Kloxo

- by BoDiE2003

Hello, this is my first time at ServerFault, I'm a stackoverflow user. I'm faceing the next problem and may be its me, but I can't find proper guides to set up a domain and nameservers for a dedicated box. I have a domain, at whois.com, and a Dedicated server at Reliable Hosting Services, the server has 5 IPs, I know that I need 2 of them for the nameservers. Right now, my domain at whois.com is using nsX.whois.com nameservers and it has 2 child nameservers: ns1.mydomain.com & ns2.mydomain.com pointing to those 2 IPs from my Server. Whats next? I still cannot set that domain as my main server domain since it says: To map an IP to a domain, the domain must ping to the same IP, otherwise, the domain will stop working. The domain you are trying to map this IP to, doesn't resolve back to the IP, and so it cannot be set as the default domain for the IP. Well and I'm stuck on those steps, whats next to have my nameservers working and my main domain assigned to my server? Thank you very much and happy new year!!

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Manual NAT on Checkpoint (Redirect all http requests to a local web server)

- by kulakli

Hi, We have a proxy server in internal network and I want to redirect all internet http requests to a web server in local network. It'll be like a Network Billboard that say "No direct connection is available. Set up your proxy etc." For example: A user starts the computer Opens the browser Trys to open www.google.com Should see web server output on local network Trys another web site on internet Should see web server output on local network Sets up proxy Trys to connect to a web site Web site should be loaded I have added a simple manual NAT rule to address translation in Checkpoint firewall but it simply does not work. Here is my address translation rule Source Destination Service T.Source T.Destination T.Service MY_PC A_GOOGLE_IP ALL ORIGINAL INT_WEB_SRV ORIGINAL Then when I ping A_GOOGLE_IP, replies come from INT_WEB_SRV, as I expected. However, when I try to connect A_GOOGLE_IP from browser (http://A_GOOGLE_IP), No replies come from SYN_SENT and falls into timeout. When I look at the firewall log of INT_WEB_SRV, I can see the incoming connection requests from MY_PC is accepted and NO denies. By the way, there is no problem to see INT_WEB_SRV (http://INT_WEB_SRV) from browser. My understanding is, my nat rule at checkpoint NGX R60 does not include return packets. I definitely need some help. Regards, Burak

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Discover the public ip of a network without being connected

- by Martin Trigaux

Let say, I'm next to a network and can see the traffic (with airodump or similar tool) but can not decipher it (because I am not connected on the network). Is it possible to discover the public ip address of the network ? I know the MAC address of the users connected on the network but do I know the one of the router ? If yes, maybe there is a way to do the matching. I know IP addresses are not forever but some addresses are static and never change. Maybe there is a database of MAC address having recorded that. Google has a database that match MAC address and geographical coordinates so why not with IP addresses ? Other idea, if I know where am I, I can maybe guess the IP range used in the city by the ISP (is it findable ?) and then try to "ping" each IP on the range (if it is a /24, it's possible, even /16 maybe). Will I get some information like the MAC of the box or see some traffic on the network ? These are two ideas I had. I don't know if they are doable, certainly not perfect. Do you think of some others ? By trying several methods, maybe I can get a guess with a bit of luck. Thank you

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"Network is unreachable" When pinging google, can connect to internal computers on debian VM

- by musher

Similar to this SU question: "Network is unreachable" when attempting to ping google, but internal addresses work Actually, it's pretty much the same base issue. I went through that thread trying to find a solution, I changed my resolv.conf: before: domain [my work domain] search [my work domain] nameserver [my gateway] nameserver [my gateway2] I changed it to: after: domain [my work domain] search [my work domain] nameserver 8.8.8.8 nameserver 8.8.4.4 However, any time I reboot the computer the resolv.conf gets overwritten to the previous version (the 'before' above). The issues began after I installed virtualbox additions, X server and (specifically) LXDE: Cat of apt history.log: Start-Date: 2014-08-21 10:03:42 Commandline: apt-get install virtualbox-guest-utils virtualbox-guest-dkms Install: x11-xkb-utils:amd64 (7.7+1, automatic), libxaw7:amd64 (1.0.12-2, automatic), xfonts-utils:$ End-Date: 2014-08-21 10:03:56 Start-Date: 2014-08-21 10:18:39 Commandline: apt-get install lxde Install: desktop-base:amd64 (7.0.3, automatic), libgoa-1.0-0b:amd64 (3.12.4-1, automatic), lxmenu-d$ End-Date: 2014-08-21 10:21:52 Start-Date: 2014-08-21 10:26:40 Commandline: apt-get upgrade Upgrade: libio-socket-ssl-perl:am ifconfig on the guest: root@Peridot:~# ifconfig eth0 Link encap:Ethernet HWaddr 08:00:27:89:c9:20 og inet addr:172.31.2.102 Bcast:172.31.2.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fe89:c920/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2281 errors:0 dropped:1 overruns:0 frame:0 TX packets:463 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:266507 (260.2 KiB) TX bytes:120554 (117.7 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:4 errors:0 dropped:0 overruns:0 frame:0 TX packets:4 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:240 (240.0 B) TX bytes:240 (240.0 B) The adapter in VBox is a bridged adapter directly onto my ethernet connection; as are my other 2 VMs (which work) Other SU questions I've tried: "connect: Network is unreachable" in VirtualBox VM

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VMWare use of Gratuitous ARP REPLY

- by trs80

I have an ESXi cluster that hosts several Windows Server VMs and around 30 Windows workstation VMs. Packet captures show a high number of ARP replies of the form: -sender_ip: VM IP -sender_mac: VM virtual MAC -target_ip: 0.0.0.0 -target_mac: Switch interface MAC The specific addresses aren't really a concern -- they're all legitimate and we're not having any problems with communications (most of the questions surrounding GARP and VMWare have to do with ping issues, a problem we don't have). I'm looking for an explanation of the traffic pattern in an environment that functions as expected. So the question is why would I see a high number of unsolicited ARP replies? Is this a mechanism VMWare uses for some purpose? What is it? Is there an alternative? EDIT: Quick diagram: [esxi]--[switch vlan]--[inline IDS]--[fw]--(rest of network) The IDS is complaining about these unsolicited ARPs. Several IDS vendors trigger on ARP replies without a prior request, or for ARP replies that have a target IP of 0.0.0.0. The target MAC in these replies is the VLAN interface on the switch. Capture points: -The IDS grabs the offending packets -The FW can see the same ones -A VM on the ESXi host does not see these, although there is an ARP request for a specific IP on the ESXi host that has source_ip=0.0.0.0 and source_mac=[switch vlan interface]. I can't share the captures, unfortunately. Really I'm interested in finding out if this is normal for an ESXi deployment.

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Can't access random web pages on my MacBook Pro 2012?

- by Faruk Sahin

Sometimes I can't access random web pages. The page simply doesn't load. If I wait for around a minute doing nothing, it will load. It happens very random and very intermittent. Sometimes it starts when I try to access youtube.com or cnn.com. When it starts, it happens once in a minute or once in 5 minutes for random web pages. But if I am downloading something, the download continues without any interruption. And also I am able to ping the address I can't browse. Then if I wait for around a minute, everything starts to work fine at the browser side also. I have tried a lot of different browsers. I have tried changing my DNS servers to Google's public DNS servers. Using a cable instead of the wireless connection doesn't work either. No one else in the network has this problem, but me. What can be the problem?

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Cisco Catalyst 3550 + Alteon 184 Load-Balancing Issues

- by upkels

I have just deployed a couple Cisco Catalyst 3550 switches, and a couple Alteon 184 Web Switches for load-balancing. I can ping all RIPs and VIPs to/from the Alteon. Topology Before: (server) <- (Alteon) <- (Internet) Topology Now: (server) <- (3550) <- Alteon <- (Internet) Cisco Port Configuration (Alteon Uplink Port): description LB_1_PORT_9_PRIMARY switchport access vlan 10 switchport mode access switchport nonegotiate speed 100 duplex full Alteon Port 9 Configuration (VLAN 10 WAN): >> Main# /c/port 9/cur Current Port 9 configuration: enabled pref fast, backup gig, PVID 10, BW Contract 1024 name UPLINK >> Main# /c/port 9/fast/cur Current Port 9 Fast link configuration: speed 100, mode full duplex, fctl none, auto off Cisco Configuration (Load-Balanced Servers Port): description LB_1_PORT_1_PRIMARY switchport access vlan 30 switchport mode access switchport nonegotiate speed 100 duplex full Alteon Port 1 Configuration (VLAN 30 LOAD-BALANCED LAN): >> Main# /c/port 1/cur Current Port 1 configuration: enabled pref fast, backup gig, PVID 30, BW Contract 1024 name LB_PORT_1 >> Main# /c/port 1/fast/cur Current Port 1 Fast link configuration: speed 100, mode full duplex, fctl both, auto on Each of my servers are on vlan 10 and 30, properly communicating. I have tried to turn on VLAN tagging on the Alteon, however it seems to cause all communications to stop working. When I tcpdump -i vlan30 on any of the webservers, I see normal ARP communications, and some STP communications, which may or may not be part of the problem: ... 15:00:51.035882 STP 802.1d, Config, Flags [none], bridge-id 801e.00:11:5c:62:fe:80.8041, length 42 15:00:51.493154 IP 10.1.1.254.33923 > 10.1.1.1.http: Flags [S], seq 707324510, win 8760, options [mss 1460], length 0 15:00:51.493336 IP 10.1.1.1.http > 10.1.1.254.33923: Flags [S.], seq 3981707623, ack 707324511, win 65535, options [mss 1460], len gth 0 15:00:51.493778 ARP, Request who-has 10.1.3.1 tell 10.1.3.254, length 46 etc... I'm not sure if I've provided enough information, so please let me know if any more is necessary. Thank you!

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Internet in the router but not in the local network.

- by TheMouse

I have a PC and a laptop (Windows 7 - both) which should connect through router to Internet. The router is Linksys wrt120. My ISP is using PPPoE. I have connected the Internet cable to the router, clone the MAC of my PC, writing the username and the password for my Internet connection. After seconds the router has acquired IP from my ISP. I have used the administration panel of Linksys and with the help of the ping and tracert commands which are built into it - I can connect to the world, outside the network. The problem is when I try to connect the PC or the laptop to the network. There's no problem here. The DHCP server of the router gives them appropriate addresses. The problem is that they couldn't connect to either Internet addresses (google.com) or IP addresses. But they can connect to the router and its control panel. I tried several times, reset the router..but there's no Internet..still.

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Why does my Windows 8 Pro Hyper-V guest have no internet?

- by Perplexed

Trying to get this working on my Windows 8 Pro machine. I created an External Switch Assigned the newly available adapter to a Guest machine with Win 2008 os. My host has internet connection. Host can ping Guest, Guest cannot ping Host. Guest has no internet connection. Pasting the IP of both host and guest. HOST ========================== Ethernet adapter vEthernet (EXTSW01): Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Hyper-V Virtual Ethernet Adapter #2 Physical Address. . . . . . . . . : 9C-B7-0F-0F-D7-D0 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::5434:a9fd:8611:d207%54(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.0.15(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : Saturday, September 8, 2012 12:34:44 PM Lease Expires . . . . . . . . . . : Saturday, September 15, 2012 12:34:44 PM Default Gateway . . . . . . . . . : 192.168.0.1 DHCP Server . . . . . . . . . . . : 192.168.0.1 DHCPv6 IAID . . . . . . . . . . . : 916240141 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-DC-C9-2C-9C-B7-0D-0D-D7-D0 DNS Servers . . . . . . . . . . . : 64.71.255.999 NetBIOS over Tcpip. . . . . . . . : Enabled GUEST ========================== Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Microsoft Virtual Machine Bus Network Adapter Physical Address. . . . . . . . . : 00-15-5D-3F-0F-00 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::953f:ec5c:5d84:1b50%11(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.0.20(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 0.0.0.0 DHCPv6 IAID . . . . . . . . . . . : 234886493 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-DD-2F-29-0F-15-5E-00-0F-00 DNS Servers . . . . . . . . . . . : ::1 127.0.0.1 NetBIOS over Tcpip. . . . . . . . : Enabled

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Uninstalled server 2008 now router won't handle DHCP

- by john

My set up is this. server behind router, router has a server and switch connected to it with multiple computers. router used to serve DHCP and DNS, a couple of days ago installed AD, DNS and DHCP on the server, and the server gave out IP's. For various reasons we had to uninstall the domain on our server. I removed AD, DHCP and DNS from the roles and set the router back to serving DHCP and DNS. Now I can't get computers on the network. I reset my router back to factory defaults, and if I plug a computer directly into the router I can get a IP address, but all the computers behind the switch can't get an IP address and can't see the router. All my computers say unidentified network, and if I ping the router it says host is unreachable. On the other hand, my wireless devices are just fine and connect no problem. But for desktops, ipconfig /release doesn't release anything and /renew can't find a server to renew on. My router log shows several FIN scans but they are from innocuous websites (google, netgear) and it shows a couple of smurf attacks but they are all from my external IP. Any ideas? the server isn't even connected to the route right now, and all the computers are set for dynamic IP addresses.. I don't know what else to try? Any help?

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Unable to ssh in Beagle Bone Black

- by SamuraiT

I wanted to install pip onto beagle bone black,and I tried this: /usr/bin/ntpdate -b -s -u pool.ntp.org opkg update && opkg install python-pip python-setuptools then, it threw errors,but Unfortunately, I didn't log that errors. it was occurred a week ago and was't solved yet. I wanted to solve it now and I tried connect by ssh,but I failed. When I ping to beagle bone, it responds, and Cloud9 IDE is working too but not ssh. I don't think this is serious problem since I can connect to beagle bone by other methods: Cloud9 or so. However, to use python on beagle bone, I need to connect by ssh. Before trying to update and install python-pip, I could connect by ssh. Do you have any ideas to solve this connection problem? note I use default OS: Angstrom I don't use SD card. HOST PC is mac, OS.X 10.9 connect by USB serial I checked this but this wasn't helpful http://stackoverflow.com/questions/19233516/cannot-connect-to-beagle-bone-black I could connect by GateOne SSH client, but still unable to connect from terminal.

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can't get to admin page after factory reset netgear wg602

- by stefanB

I have wireless Netgear wg602 on my home network (connected to my internet modem/router). I've had it secured and locked down to only accept connection from specific MAC addresses. I've forgotten the password that I used but my Mac Book laptops can still connect (multiple OS updates - it can't retrieve and display the password but it can use it to log in to WPA) so I want to reconfigure it from scratch (have some new devices). I tried to reset the Netgear wg602 to factory settings (pressed reset button for 10 sec), reset my laptop IP address to local address suggested in manual (192.168.0.210 net mask 255.255.255.0), connect Netgear via ethernet cable to my mac book pro but I can't get to the admin page at 192.168.0.227 as suggested by manual (firefox or safari). At this stage the Netgear is not connected to router, it is only connected to mac book. I can't ping the wireless access point either (but it is on all lights are on). What am I doing incorrectly? Last time I configured it via Windows now I only have Mac Book (which I've used with the wireless access point for 2 years so no compatibility problems).

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Google Apps: MX records for zonefile

- by 23tux

Hi everybody, I have a question about using Google Apps for handling emails. I don't want to set up a whole entire mail system on my server, so I decided to use Google Apps. The ownership of my domain is approved, and now I'm trying to change the MX records in the zone file of my domain. But I think I'm doing wrong, it doesn't work. I want to use mail.mydomain.com as a adress to the mail server for POP, SMTP and IMAP. My zone file looks like this: $TTL 86400 @ IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. ( 2011011700 ; serial 14400 ; refresh 1800 ; retry 604800 ; expire 86400 ) ; minimum @ IN NS robotns3.second-ns.com. @ IN NS robotns2.second-ns.de. @ IN NS ns1.first-ns.de. @ IN A 111.111.111.111 localhost IN A 127.0.0.1 www IN A 111.111.111.111 ftp IN CNAME www loopback IN CNAME localhost mail IN CNAME @ relay IN CNAME www @ IN MX 10 ALT1.ASPMX.L.GOOGLE.COM. @ IN MX 10 ASPMX3.GOOGLEMAIL.COM. @ IN MX 10 ASPMX2.GOOGLEMAIL.COM. @ IN MX 10 ASPMX.L.GOOGLE.COM. @ IN MX 10 ALT2.ASPMX.L.GOOGLE.COM. I hope someone can figure out, what's wrong with this configuration. When I start a ping on mail.mydomain.org I get an answer from 111.111.111.111 and not from the google server ALT1.ASPMX.L.GOOGLE.COM. thx, tux

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Is there any way for ME to improve routing to an overseas server? [migrated]

- by Simon Hartcher

I am trying to make a connection to a gaming server in Asia from Australia, but my ISP routes my connection through the US. Tracing route to worldoftanks-sea.com [116.51.25.54]over a maximum of 30 hops: 1 <1 ms <1 ms <1 ms 192.168.1.1 2 34 ms 42 ms 45 ms 10.20.21.123 3 40 ms 40 ms 43 ms 202.7.173.145 4 51 ms 42 ms 36 ms syd-sot-ken-crt1-ge-6-0-0.tpgi.com.au [202.7.171.121] 5 175 ms 200 ms 195 ms ge5-0-5d0.cir1.seattle7-wa.us.xo.net [216.156.100.37] 6 212 ms 228 ms 229 ms vb2002.rar3.sanjose-ca.us.xo.net [207.88.13.150] 7 205 ms 204 ms 206 ms 207.88.14.226.ptr.us.xo.net [207.88.14.226] 8 207 ms 215 ms 220 ms xe-0.equinix.snjsca04.us.bb.gin.ntt.net [206.223.116.12] 9 198 ms 201 ms 199 ms ae-7.r20.snjsca04.us.bb.gin.ntt.net [129.250.5.52] 10 396 ms 391 ms 395 ms as-6.r20.sngpsi02.sg.bb.gin.ntt.net [129.250.3.89] 11 383 ms 384 ms 383 ms ae-3.r02.sngpsi02.sg.bb.gin.ntt.net [129.250.4.178] 12 364 ms 381 ms 359 ms wotsg1-slave-54.worldoftanks.sg [116.51.25.54] Trace complete. Since I think it will be unlikely that my ISP will do anything, are there any ways to improve my routing to the server without them having to intervene? NB. The game runs predominately over UDP, so I believe most low ping services are out of the question, as they rely on TCP traffic.

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Prevent Linux from processing incoming ICMP Host unreachable packets

- by bbc

I have a test setup with one host on a network (10.1.0.0/16) talking via TCP to another one on another network (10.2.0.0/16) and a gateway in the middle. Sometimes, the TCP connection is lost and while scanning the trace (pcap), I looks like it's because of just one ICMP Host unreachable message sent by the gateway to 10.1.0.1 at some point. 10.1.0.1 then sends a TCP RST to 10.2.0.1. In my opinion, the gateway (pfSense) is broken or not configured correctly but anyway, for testing purposes, I'd like to block this kind of ICMP on the host (10.1.0.1) before it has an influence on my TCP connection (or does it? I'm not even sure). I've tried iptables: iptables -I INPUT -i eth0 -p icmp --icmp-type host-unreachable -j DROP but while it does a good job at preventing userpace applications like ping from receiving these ICMP messages, my TCP connection still comes to an end when the alleged "killer ICMP packet" is sent by the gateway. Am I right about how it is processed? If yes, then what can I do to achieve my goal?

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allow spoofing when using tun

- by Johnny

I have a working openvpn setup with a server and a number of clients. How would i go around allowing IP spoofing through the openvpn server? (to demonstrate security concepts)? A normal ping from client to server goes through all right: root@client: hping3 10.8.0.1 HPING 10.8.0.1 (tun0 10.8.0.1): NO FLAGS are set, 40 headers + 0 data bytes len=40 ip=10.8.0.1 ttl=64 DF id=0 sport=0 flags=RA seq=0 win=0 rtt=124.7 ms root@server:/etc/openvpn# tcpdump -n -i tun0 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on tun0, link-type RAW (Raw IP), capture size 65535 bytes 10:17:51.734167 IP 10.8.0.6.2146 > 10.8.0.1.0: Flags [], win 512, length 0 But when spoofing a packet, it does not arrive at the openvpn server: root@client: hping3 -a 10.0.8.120 10.8.0.1 HPING 10.8.0.1 (tun0 10.8.0.1): NO FLAGS are set, 40 headers + 0 data bytes root@server:/etc/openvpn# tcpdump -n -i tun0 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on tun0, link-type RAW (Raw IP), capture size 65535 bytes My current config files server.conf local X.Y.Z.P port 80 proto tcp dev tun ca ca.crt cert server.crt key server.key # This file should be kept secret dh dh1024.pem server 10.8.0.0 255.255.255.0 push "redirect-gateway def1 bypass-dhcp" keepalive 10 120 comp-lzo persist-key persist-tun persist-local-ip status openvpn-status.log verb 3 client.conf client dev tun proto tcp remote MYHOST..amazonaws.com 80 resolv-retry infinite nobind persist-key persist-tun ca ca.crt cert client.crt key client.key ns-cert-type server comp-lzo verb 3

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bond0:0 + define virtual IP

- by yael

in my Linux server I have the following: Linux Version - RedHat-Linux- 5.3.0.0 (this Linux server only only one LAN) more /etc/sysconfig/network-scripts/ifcfg-bond0:0 DEVICE=bond0:0 ONBOOT=yes BOOTPROTO=static IPADDR=10.10.10.12 NETMASK=255.255.255.0 ifconfig -a bond0 Link encap:Ethernet HWaddr 00:00:00:00:00:00 UP BROADCAST MASTER MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) bond0:0 Link encap:Ethernet HWaddr 00:00:00:00:00:00 inet addr:10.10.10.12 Bcast:1.1.1.255 Mask:255.255.255.0 UP BROADCAST MASTER MULTICAST MTU:1500 Metric:1 eth0 Link encap:Ethernet HWaddr 00:0E:0C:C7:F8:92 inet addr:1.1.1.1 Bcast:1.1.1.255 Mask:255.255.255.0 inet6 addr: fe80::20e:cff:fec7:f892/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8600 errors:0 dropped:0 overruns:0 frame:0 TX packets:4764 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:717979 (701.1 KiB) TX bytes:598620 (584.5 KiB) Memory:b8820000-b8840000 my problems: why I get HWaddr 00:00:00:00:00:00 and not the real MAC address I cant ping to other server with 10.10.10.11 from my server is it possible to define bond0:0 when I have only one LAN (eth0) other info: more /etc/modprobe.conf alias eth0 e1000e alias eth1 e1000e alias eth2 e1000e alias eth3 e1000e alias scsi_hostadapter mptbase alias scsi_hostadapter1 mptsas alias scsi_hostadapter2 ata_piix alias bond0 bonding alias bond1 bonding

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MacBook Pro with OSX 10.6.3 (Snow Leopard) Wi-Fi network connection breaks after few minutes

- by Yanick Landry

I have a MacBook Pro with OSX 10.6.3 (Snow Leopard). After connecting on a Wi-Fi network, the connection "breaks" after a few minutes. What I mean by "breaking" is that all requests, whether it is loading a web page, connecting to a share folder, connecting to my local router at 192.168.0.1, or pinging anything doesn't get through (time out). When in a "break" situation, I can see in the Network Settings panel that I still have an active IP, which I can successfully ping. I have this problem at home with a router D-Link DI-624 and at work with a D-Link WBR-2310, all with updated firmwares. I thought DHCP was the issue. So I tried assigning a fixed IP address (192.168.0.166). It successfully connects, but after a few minutes, the connection still breaks. The solution I'm currently using is that I disable the AirPort (on the Network icon menu in the top bar), wait a few seconds then re-enable it. It then quickly works, but the connection still breaks after a few minutes. I tried Googling my problem but I think I can't find any good keywords ! It's my first question here, so sorry if I don't respect some rules.

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